Pyridines; XVI.1Reactions ofN1-(Arylethenyl)benzamidines with lsocyanates and Phenyl Isothiocyanate. A Facile Synthesis ofN1-(1,2-Diarylethenyl)-N2-(alkyl- or aryl-aminocarbonyl)benzamidines and Substituted 2-Oxo- or 2-Thioxo-1,2,3,4-tetrahydro-1,3,5-triazines
摘要:
N 1-(1,2-二芳基乙烯基)-N 2-(烷基或芳基氨基羰基)苯甲脒通过各种异氰酸酯与 N 1-(1,2-二芳基乙烯基)苯甲脒在四氢呋喃中的反应很容易制备,产率高达 61-90%。当异氰酸酯(以及异硫氰酸苯酯)与酰胺在沸腾的甲苯中,在催化量的喹啉存在下进行加成反应时,生成的 N 1,N 2-二取代苯甲脒会环化生成取代的 2-氧代或 2-硫代-1,2,3,4-四氢-1,3,5-三嗪,产率为 31-92%。
Pyridines; XVI.<sup>1</sup>Reactions of<i>N</i>
<sup>1</sup>-(Arylethenyl)benzamidines with lsocyanates and Phenyl Isothiocyanate. A Facile Synthesis of<i>N</i>
<sup>1</sup>-(1,2-Diarylethenyl)-<i>N</i>
<sup>2</sup>-(alkyl- or aryl-aminocarbonyl)benzamidines and Substituted 2-Oxo- or 2-Thioxo-1,2,3,4-tetrahydro-1,3,5-triazines
N 1-(1,2-Diarylethenyl)-N 2-(alkyl- or arylaminocarbonyl)benzamidines are easily prepared in good to high yields (61-90%) by reaction of various isocyanates with N 1-(1,2-diarylethenyl)benzamidines in tetrahydrofuran. When this addition reaction of the isocyanates (and also of phenyl isothiocyanate) with the amidines is performed in boiling toluene in the presence of catalytic amounts of quinuolidine the resultant N 1,N 2-disubstituted benzamidines are cyclized to give substituted 2-oxo- or 2-thioxo-1,2,3,4-tetrahydro-1,3,5-triazines in yields of 31-92%.
N 1-(1,2-二芳基乙烯基)-N 2-(烷基或芳基氨基羰基)苯甲脒通过各种异氰酸酯与 N 1-(1,2-二芳基乙烯基)苯甲脒在四氢呋喃中的反应很容易制备,产率高达 61-90%。当异氰酸酯(以及异硫氰酸苯酯)与酰胺在沸腾的甲苯中,在催化量的喹啉存在下进行加成反应时,生成的 N 1,N 2-二取代苯甲脒会环化生成取代的 2-氧代或 2-硫代-1,2,3,4-四氢-1,3,5-三嗪,产率为 31-92%。